It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a congruent number.
It is an unprimeable number.
Almost surely, 2999999988 is an apocalyptic number.
It is an amenable number.
999999988 is a wasteful number, since it uses less digits than its factorization.
999999988 is an evil number, because the sum of its binary digits is even.
The square root of 999999988 is about 31622.7764119471. The cubic root of 999999988 is about 999.9999960000. Note that the first 5 decimals are identical.
The spelling of 999999988 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-eight".